Register to reply

Universal Expansion

by CBJammin103
Tags: expansion, universal
Share this thread:
CBJammin103
#1
Jul26-05, 07:08 PM
P: 4
As far as I know it's generally accepted that the entire universe is expanding; however, I recall hearing or reading that as far as we can observe, it is expanding faster than the speed of light.

How is this possible? Assuming that it is in fact expanding faster than the speed of light, of course. I'm not sure, but I'm pretty sure I remember hearing that somewhere.
Phys.Org News Partner Astronomy news on Phys.org
Eclipsing binary stars discovered by high school students
Swirling electrons in the whirlpool galaxy
A spectacular landscape of star formation
turbo
#2
Jul26-05, 08:16 PM
PF Gold
turbo's Avatar
P: 7,363
Quote Quote by CBJammin103
As far as I know it's generally accepted that the entire universe is expanding; however, I recall hearing or reading that as far as we can observe, it is expanding faster than the speed of light.

How is this possible? Assuming that it is in fact expanding faster than the speed of light, of course. I'm not sure, but I'm pretty sure I remember hearing that somewhere.
You will hear from conventional cosmologists that the universe can expand so fast that there is no problem with any observed expansion that is apparently faster than the speed of light. If you'd like the grand tour, just be persistent and it will be forthcoming.

My personal view of physics contains an alternate route, branching at the distance/redshift relationtionship often attributed to Hubble, but never embraced or endorsed by him. Namely, the concept that the universe must be exploding because the farther galaxies are, the more they are redshifted.

It is entirely possible that light can be redshifted by travelling long distances, interacting with transmissive media etc, etc. Hubble was open to this - more recent folks are not.
CBJammin103
#3
Jul26-05, 08:22 PM
P: 4
You will hear from conventional cosmologists that the universe can expand so fast that there is no problem with any observed expansion that is apparently faster than the speed of light. If you'd like the grand tour, just be persistent and it will be forthcoming.
I'm not quite sure what you mean by this...?

I guess I'm not too sure on how we can measure universal expansion in the first place though.

Danger
#4
Jul26-05, 08:22 PM
PF Gold
Danger's Avatar
P: 8,964
Universal Expansion

Check back a few pages to here . It should clarify things. If not, there are a few other threads kicking about that deal with the same thing.


Register to reply

Related Discussions
Universal expansion velocity SR or GR? Special & General Relativity 6
Universal expansion Cosmology 21
Universal Expansion Cosmology 11
Q's about universal expansion Astronomy & Astrophysics 9